Gilroy 35 Miles Over the Hill From Santa Cruz | <p>http://www.extension.iastate.edu/Pages/ansci/beefreports/asl1775.pdf<br /><br /> 2002 Beef Research Report —<br /> Iowa State University of yellow. <br /><br />Cattle fed high levels of roughage or those grazing pastures often have yellow fat due to pigments of the forage. The steers fed yellow corn probably did not have many yellow pigments in the fat because they were fed a high concentrate diet with minimal quantities of roughage for nearly 200 days. Feeding white corn during the 180 days prior to harvest reduced the color score of the fat to 1.8, a small but significant reduction. Barley often is fed to cattle to produce whiter fat for some export markets. The results of this study indicate that white corn has feed value similar to yellow corn for finishing beef cattle and may be a substitute for barley to produce whiter fat in beef carcasses. Table 1. Performance of Angus steer calves fed white or yellow corn. Corn Item White Yellow SEM Starting wt., lbs. 608.7 603.8 4.45 Ending wt., lbs. 1209.1 1207.3 8.71 Days fed 180 180 Daily gain, lbs. 3.34 3.35 0.047 Feed DM per day, lbs. 18.3b 17.7c 0.23 Feed/gain 5.49d 5.28e 0.052 aStandard error of the mean. b,cMeans with different superscripts are significantly different (P < .05). d,eMeans with different superscripts are significantly different (P < .1). Table 2. Effects of feeding white or yellow corn on carcass measurements of Angus steer calves. Corn Item White Yellow SEMa Carcass wt., lbs. 741.3 740.8 5.25 Dressing percent 61.3 61.4 0.22 Fat thickness, in. 0.45 0.44 0.020 Ribeye area, sq in. 12.9 12.5 0.22 KPH, % 1.70 1.74 0.086 Marblingb 554 544 17.9 Color of fatc 1.78d 2.22e 0.087 Carcass grades Percent Choice 21.6 20.8 Percent Choice - 54.2 62.5 Percent Select 22.8 16.7 Percent Standard 1.4 Percent Yield Grade 1 4.2 8.3 Percent Yield Grade 2 67.2 64.6 Percent Yield Grade 3 27.2 25.0 Percent Yield Grade 4 1.4 2.1 Percent Certified Angus Beef 20.1 20.8 Calculated yield grade 2.66 2.71 0.081 aStandard error of mean. b500 = Small0, 400 = Slight0. cColor of fat is related to nine point scale, with 1 = white and 9 = yellow. d,eMeans with different superscripts are significantly different (P < .01). Implications The results of this study suggest that white corn can be fed to finishing cattle without loss of performance or carcass quality and yield grades. The advantage of whiter fat in carcasses from cattle fed white corn may have value in some export markets. Acknowledgments Materials for this experiment were supplied as follows—Component TE-S® implants: VetLife, Overland Park, Kansas; Rumensin®: Elanco Products, Indianapolis, Indiana; and vitamin A: Roche Animal Nutrition and Health, Paramus, New Jersey. The assistance of Rod Berryman, research farm superintendent; Julie Roberts, Beef Center secretary; and the animal caretakers at the ISU Beef Nutrition and Management Research Center is appreciated.</p>
Edited by V_Key 10/11/2011 13:49
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Is grassfed beef fat always yellow?
